Power transmitter



P 1952 P. VSCHULDER 2,609,075

POWER TRANSMITTER Filed Nov. 9, 1950 J T /3 I In Iz INVENTO [94w lwazazwPatented Sept. 2, 1952 owns-45mm PATENT orFrCE-fy- IPOWERTRANSMITTEFPaul Schulder, Brooklyn, N. Y., assignor to Consolidated Sewing Machine& Supply 00., Inc., New York, N. -Y., a corporation of New York 1Application November 9,1950, Serial No. 194,920

The invention disclosed herein relatesto power transmitters forsewingmachines and the like, and is in the nature of an improvement onthe transmitter disclosed in copending application Serial No. 81,643,filed March 16th, l9i9, issued as Patent No. 2,544,768, March 13th,1951.

- Objectsof the present invention particularly are to provide a cushionmounted transmitter completely enclosed and protected against dust,

lint, threads and the like, which will be small in size and compact incharacter so as not to take up much space below-the table and beentirely out of the Way of the operator.

Other important objects of the invention are 'to-reduce cost ofconstruction and simplify assembly and mounting of the unit.

- The foregoing and other desirable objects are attained by the novelfeatures of construction, combination and relation of part as set forthin the followingspecification. 1

The drawing accompanying and forming part ofthe specificationillustrates a present practical embodiment of the invention. Actualstructure, however, may be modified and changed as regards the immediateillustration, all Within the true intent and scope of the invention ashereinafter defined and claimed.-- a

Fig. 1 in the drawing is a side elevation of the transmitter as mountedin operating position, with parts broken away and shown in section;Fig-2 is an end and vertical cross sectional view as taken onsubstantially the plane of line 2-z of Fig. 1;

Fig. 3 is an enlarged plan and broken sectional view;

Fig. 4 is a. further enlarged broken sectional .detail of the slidingshaft bearing construction as taken on substantially the planeof line 44ofFigZ. I

As shown in Figs. 1 and 3, the transmitter comprises an electric motor Ihaving hubs 8, 9, at oppositeends of the same; carrying rubberor likecushions-Iii, ll, clamped in the dependent arms 12, [3,of a U-form ofbracket [4 which is attached by screws or other fastenings to the underside of the table [5.

This constitutes the sole mounting means for the unit.

The motor is of relatively small diameter and is set up high between thearms of the mounting bracket so as to project only a small distancebelow the table and hence be entirely out of the way of the operator.

These purposes are further carried out in the illustration by having thelower arm l6 of the 2 Claims (01. 192-18) angled control lever ll lieclose in substantially parallel relation'to the under side of the motor,accomplishing this partly by pivoting the upright arm l8 of the lever ati9 by short bracket arm 29 projecting substantially horizontally fromthe end of the lower housing and by connecting the spring 2i in asubstantially horizontal relation between the upright arm of the lever,and a short bracket lug 22 projectin a slight distance below the motorhousing.

The clutch andbrake mechanismis shown in Fig. 3 as made up of a drivingclutch plate-23 on the motor shaft 24, and a driven clutch plate 25engageable therewith by movementin one direction and engageable with thebrake surface 2t by movement in the opposite direction.

The driven clutch plate 25 is fixed on a shaft El and this shaft, asshown more fully in Fig. 4, is grooved to form spaced, parallel ballraces 28, 29, for balls 3! running in outer ball races 32, in the endsof a sleeve 34 slidable in the tubular extension 35 of the mounting hub9.

I'he ball bearings'described are shown in Fig. 4 as including ballretainers 3B, dust excluding and lubricant sealing rings 3? and snaprings or like retainers 38.

By this combination and assembly the requirement for inner race rings isavoided and the over-all diameter of the bearings, the bearing sleeveand the hub in which the bearing sleeve slides, is kept down to aminimum without sacrifice of strength or running qualities.

The sleeve 34 is slid back and forth in the hub 35 by a stud 39 having arounded or ball shaped inner end engaged in an opening 40 in the side ofthe bearing sleeve, this stud projecting through a slot M in the side ofthe supporting hub and being carried by the'upper end of the controllever ll.

The outer end of the driven shaft 21 carries the pulley 22 which drivesthe sewing machine by belt 43.

The provision of the innerball races by int'e' gral grooves in the shaftpermits the use of a short, rigid, large diameter shaft withoutincreasing over-all dimensions of the ball bearings and mountingstructure.

The ball shaped housing 44 for the clutch and brake may be a completelyclosed, circular casting machined to fit the end of the motor frame andattached thereto by the four screws 45 shown in Fig. 2. This end housingmay be integral with or formed separately from the motor end bell 46which is shown in Fig. 1 as carrying the anchorage lug 22 for the spring2 l The resilient cushions l and H are shown as rings of rubber or likematerial encased in metal rings 41 and forced over the motor end hubs,which latter are shown in Fig. 2 as ridged at 48 to effect aninterlocking engagement of the cushions on the motor hubs. In practicethe cushioning washers may be molded in complemental fashion to fit theridged or ribbed end hubs of the motor structure.

The motor is shown as suspended in the arms of the mounting bracket byforming the lower ends of the arms with substantially semi-circularrecesses 49, Fig. 2, to accommodate the upper halves of the metal covers41 of the cushions,

and by notching the sides of thebracket arms at I 50 to provideappropriate shoulders over which the upper ends of the short links 5|are hooked, said links slotted at their upper ends at '52to engage overthe shoulders 53, and angled at their lower ends to accommodate theclamp screws 54.

simple construction provides a firm, .secure mounting 1 for thecushions, which .can be quickly applied or .released and which, as shownin the end view, Fig. 2, does not add any bulk, since it comes withinthe width of the arms of the supporting bracket.

With the construction described both the overall length and the over-alldiameter of the complete unit are kept to a minimum, providingcompactness for shipping as well as foractual use. The simple clampconstruction permits quick detachment of the motor and clutch structurefrom theimounting bracket, and both these clamps are fully accessible sothat in'case of need the motor partof the unit may be quickly removedfrom the mounting bracket or, in. reverse, the motor assembly be mountedin the bracket.

The supporting of the motor assembly is effected entirely. at theoutside, leaving the motor, clutch andbrake structures completelyenclosed and protected.

The cushion support at the clutch end of the motor is locatedsubstantially in line with the sliding sleeve carrying the driven clutchshaft, effectin a balanced support for all the parts.

The construction as a whole is simple in design, consisting of but few,readily assembled parts which :can be produced at low cost. The closecoupledrelation between the control lever,

sliding sleeve and return spring enables operationby means of a smallsize lever such as shown in Fig. 1, which will lie close and take up but:smalLspace .over the side and end 0f the motor housing. This. smallsize lever may be actuated in thecustomary manner by means of a link .55extending from the long arm of the lever to a foot pedal or other suchcontrolling element.

What is claimedis:

1. A power transmitter of the character dis- .closed comprising anelectric motor having a shaft carrying a driving clutch element at oneend of the motor, a closed clutch housing secured over said end of saidmotonsaid closed clutchhousing completely enclosing the end of the motorand .side arms embracing the motor and clutch housing and connected withsaid cushions, a. bearing sleeve slidaibly operabl in said elongatedbearing,

a shaft journaled in said sleeve and carrying at the inner end a drivenclutch member for cooperation with the driving clutch member and withthe braking surface and at the outer end a transmission pulley and ashift lever pivotally supported on the clutch housing and having anoperating connection extending through said elongatedslot at .a pointadjoining the mounting cushion .on the hub of the.clutch housing, intoengagement with the bearing sleeve and whereby the clutch and brakemechanism completely enclosed and supported substantially wholly betweenthe cushioned mounting hubs and the clutch shift mechanismis immediatelyadjoining oneof the cushioned mounting hubs.

.2. A power transmitter of the character disclosed comprising anelectric .motor having a shaft carrying'a driving clutch element,aclutch housing secured over the end of said motorand havingan elongatedbearing in line with the motorshaft, said elongated bearing having alongitudinally extendedslotin theside of the same, a bearing sleeveslida-bly operablein said elongated bearing, a. shaft journaledinsaidlsleeve and carrying at the inner .end a driven :clutch member forcooperation with the driving clutch member and at the outer endatransmission pulley and-a shift lever pivotally'supported on the clutchhousing and having an operating connection extending through saidelongated slot into engagement with the bearingsleeve, said slidablesleeve having integral .ball race groovesin the opposite ends of thesame. the'shaft journaled therein having companion ball 1 race groovesspacedin line with said ballrace grooves in the sleeve and ballsoperating in thecompanion ball race forming grooves in the .sleeve andshaft therebyrotatably keyingsaid shaft to shift longitudinally withsaid sleeve.

PAULSCHULDER.

REFERENCES CITED The following references are of record inthe file ofthisypatent:

UNITED STATES PATENTS Number 7 Name Date 2,037,644 Voigt ..Apr. 14, 19362,074,136 Welch Mar. 16, 1937 2,408,808 Pauhls et a1. Oct. 8,1946

